问题

iOS启动后，上线出现黑边，没有使用.xib，使用的是LaunchImage启动页

问题如图

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方案

正确设置好启动图片就可以解决问题了

image.png

设置参考

https://stackoverflow.com/questions/25816759/what-are-iphone-4-7in-and-5-5in-screen-shot-dimensions
http://blog.sina.com.cn/s/blog_6c97abf10102voui.html

三分钟弄懂iPhone X 设计尺寸和适配
http://www.ui.cn/detail/283956.html
以iPhone Inch为例，让你明白UI和WEB的尺寸单位概念
http://www.woshipm.com/pd/562998.html
What iPhone screen size should you get: 4-inches, 4.7-inches, or 5.5-inches?
https://www.imore.com/what-iphone-screen-size-should-you-get

苹果官方Human Interface Guidelines](https://developer.apple.com/design/
https://developer.apple.com/ios/human-interface-guidelines/overview/iphone-x/
https://developer.apple.com/ios/human-interface-guidelines/icons-and-images/image-size-and-resolution/